High-frequency apparatus



HIGH FREQUENCY APPARATUS Filed March 31, 1922 Inventor Arthur FY1111 Dgck His Attorneg.

. To all whom it may concern:

v UNITED sTA Es PATENT OFFICE.

.ARCIPH'Iil-R F. VAN DYCK, OF SCHENEOTADY, NEW. YORK, ASSIGNOR TO GEl l'ERAL' ELEC- I TRIO COMPANY, A CORPORATION OF NEW YORK- mn-rnnounncy Arrana'ms.

Application filed March 31, 1922. Serial No.548,4 81

Be it known that I, ARTHUR 'ing at Schenectady, in the county of Schenectady, Stateof New York, have invented certain new and useful Improvements in HighrFrequency Apparatus, of which the following is a specification.

My present invention relates to apparatus for controlling high frequency currents, and more particularly to apparatus for'controlling, amplifying or detecting high frequency currents employed for signaling purposes. I The object of my invention 1s to provide an apparatus of the class referred to which will be so constructed that the control or amplifying apparatus will be 'eflectively shield ed from exterior disturbing influences which would interfere with or seriously impair the normal desired'operation of the apparatus.

The novel features which I believe to be characteristic of my invention-are set forth with particularityin the appended claims, my invention itself, however, will best be understood by reference to the following description taken in connection with the accompanying drawing in which Fig. l is a perspective view of an apparatus constructed in accordance with my -mvention and Fig. 2 is a similar perspective view of the same apparatus with the door thereof open.

The ap aratus which I have illustrated is designed or amplifying high frequency currents, being of the form commonlyknown in the art as a three-stage amplifier. My in-- spection or removal of the apparatus within the casing. The apparatus which I have i'llustrated within the casing comprises sockets 3, in which vacuum tube amplifiers may be inserted and rheostats 4 for controlling the heating current supplied to the filaments of the vacuum tubes.

In order to provide for the convenient adjustment of the filament currents, rheostats 4 are provided with handles 5 which project F. VAN- DroK, a citizen of the United States, resid-.

between the casing and the disks 7.

through openings 6 in the door 2. Since the openings in the doors must be made somewhat larger than these handles difiiculty might be experienced in the operation of the apparatus by reason of the fact that external electrical lields. would be able to pass through these openings and interfere with the desired operation of the apparatus within the casing. To overcome this difficulty I associate with each ofthe handles 5a disk 7 which is slightly larger thanthe opening in the door. I also provide contact springs 8 on the door so that when the door is closed an electrical contact is established In the case illustrated, the disks are mounted on the operating shafts secured to the handles 5 and marks 9 provided on the casing'to provide the operator with an indication of the adjustment of the rheostats. It will of course be apparent that if desired the disks may be made stationary and serve as dials in cooperation with a ointer suitably mounted on the operating andles.

' I have also indicated a switch 10 operated by a handle 11 for changing the circuit con nections within the casing in order -that-the number of stages of the amplifier employed may be varied at will. The" handle 11 also projects through an o' enin in the door and this opening is closed y a isk 7 in the manner previously described. I

While I have shown and described only one embodiment of my invention, it will be understood that many modifications in the form of the apparatus and the nature of the control apparatus emplo ed may be made without departing from t e scope of my in What I claim as new and esire to secure by Letters Patent of the United States, is

1. The combination in an apparatus for controlling high frequency currents of a casing, control devices within said casing and mounted thereon, handles for. adjusting said control devices, a door for said casing having openings therein through which said handles project, said 0 enings being of such size tha-t the door can e opened without re- -moval of the handles, and means associated vention as set forth in the ap ended claims.

with said'handles and located inside said door for completely closing the openings in the door when the door is closed.

2. The combination in an apparatus for controlling high frequency currents of a casp the door is closed.

3. The combination in an apparatus for controlling high frequency currents of a casing, control devices within said casing and mounted thereon, handles for adjusting said control devices, a door for said casing having openings therein through which said handles project, said openings being of such size that the door can be opened without removal.

of the handles, and metal disks associated with saidhandles and located inside said door for completely closing the openings in the door when the door is closed. i I

The combination in an apparatus for controlling high frequency currents of a cas-. ing, control devices within said casing and mounted thereon, handles for adjusting said control devices, a door for said casing having openings therein through which said handles project, said-openings being of such size that the door can be opened without removal of the handles, said casing being arranged to shield the control devices from exterior influences, and metal disks associated with said handles and located inside said door for completely closing the openings in the door when the door is closed.

5. The combination in an apparatus for controlling high frequency currents of a casing, control devices within said casing, handles for adjusting said control devices, a door for said casing having openings there in through which said handles project, metal said handles project, said openings being of such size that the door can be opened wlthout removal of the handles, said casing being so constructed as to shield the amplifylng apparatus from exterior influences and discs associated with said handles and located inside said door for completely closin the openings in the door when the door is cFosed.

7. The combination in a control apparatus, of a casing, control devices within said casing and mounted thereon, handles for adjusting said controLdevices, a door for said casing having openings through which said handles project, said openings beingof such a size that the door can be opened in-' dependently of said control devices.

8. The combination in a control appai ratus, of a casing, control devices within said casing and mounted thereon, handles for adjusting said control devices, a door for said casing having openings therein through which said handles project, said openings being of such a size that the door can be opened independently of said handles and metal disks associated with said handles for completely closing the openings in the door when the door is closed.

In witness whereof, I have hereunto set my hand this 30 day of March 1922.

ARTHUR F. VAN DYoKI 

